The non read book

There are said to be 170,000,000 books based on studies. It has also been studied that humans do not live long enough to read them all. With such an idea, let's suppose that there is a specific book that no one has read, no one has seen, no one knows about, but it exists. It exists in its physical state, you might have seen it in a shop, with its crimson cover and its engraved title but nevertheless as I said before you did not see it. So following this, is it true that the book exists?

A philosopher once said ‘God will cease to exist if we stop believing in him’. A quote that will be very useful for the idea raised and another quote taken from the anime Serial Experiments Lain which says ‘What you don't know is what doesn't exist’. So if NOBODY knows the book but the book is in its physical state

Does the book exist?

Well actually yes as I have told you about this book, I have described its cover and now there is an idea of the same book in your head but that is not what I am talking about.